The battle of the past between the Nightlord and the Saint left a major impact on the world. That is, a world that never sleeps, where “humans” are active during the hours the light shines, and demons known as fiends run rampant during the hours of darkness. Alushe, a knight of the Curia, is entrusted as a guard to escort the Saint Liliana, her former childhood friend.

After fighting the fiends that attacked them, the two finally arrive at the Curia, but